RBI Grade B 2008

Instructions

What should come in place of question mark (?) in the following number series ?

Question 104

9, 4.5, 4.5, 6.75, 13.5, 33.75, ?

Solution

Successive multiples of 0.5 are added

9 + $$0.5 \times 1$$ = 4.5

4.5 + $$0.5 \times 2$$ = 4.5

4.5 + $$0.5 \times 3$$ = 6.75

6.75 + $$0.5 \times 4$$ = 13.5

13.5 + $$0.5 \times 5$$ = 33.75

33.75 + $$0.5 \times 6$$ = 101.25

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